JPS6018483A - How to convert two tankers into floating docks - Google Patents

Abstract

PURPOSE:To make it possible to remodel two tankers into floating docks suitable for transporting a large size marine structure, by cutting off the periphery of the combined section of at least a part of the top deck of a side tank on each of the adjacent sides of two tankers and the top deck of the center tank, and by lowering the same down to the hull bottom section to obtain a double bottom structure. CONSTITUTION:After arranging two tankers of similar types in a dock 17 side by side, the combined section of the top deck of the side tank 18 on each of the adjacent sides of both tankers in the part excepting the front sections thereof, and the top deck 19 of the center tank, and as well the aggregates 20 attached thereto are cut off along their peripheries over a predetermined extent. The side shell platings, longitudinal bulkheads etc. of each hull 23 below the top decks 18, 19 are also cut and removed off at a predetermined height. Then, the cut-off top decks 18, 19 are lowered and then rejointed to the hull 5 to obtain a double bottom structure. With the above-mentioned steps first and second floating docks 1, 2 are obtained. By adjusting the sinkage of the above-mentined docks 1, 2 and as well by adjusting the distance therebetween, a large size marine structure such as a petroleum digging rig, etc. may be installed on the both floating docks 1, 2.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method of converting a two-tank force into a floating dock.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method by which an old or idle tongue force can be easily converted into a floating dock and used effectively.

The method according to the present invention is a method of converting a tank between two ships into a floating dock, in which the tank section between the bow and the stern is divided into a center tank and side tanks by two rows of longitudinal bulkheads,
Cutting the combined area of at least a part of the tank upper deck on the six-tank side of one tongue and the center tank upper deck, and then lowering this to the bottom of the ship to form a double bottom;
This consists of cutting the combined area of at least a part of the upper deck of the tank on the plastering side of the other tank and the upper deck of the center tank, and then lowering this to the bottom of the ship to form a double bottom. be.

Modification of the two ships' tongue forces may be performed in sequence with one of them being done first, or both may be performed in parallel.

According to the present invention, it is possible to effectively utilize old or idle tongue force by converting it into a floating dock. Also,
The modification work is simple, mainly because it is only necessary to lower the side tank upper decks and the center tank upper deck with their circumferences cut to the bottom of the ship and join them. Furthermore, the modified floating dock will have a low deck consisting of the original upper deck at the center of the ship's center and on one side, so it can be semi-submerged and used for loading and unloading ships, marine structures, etc. This can be done easily, and since the side tank remains as it is in the opposite sentence, it also has the effect of preventing waves from this direction. In addition, since the bow and stern parts remain intact, the ship has good stability during semi-submersion, and the engine room J3 and propulsion device remain in the stern part, making it possible to navigate on its own. Also,
Since the two tanks are converted into two symmetrical floating docks, large ships and marine structures can be accommodated by being sandwiched between the two floating docks.

The present invention will be described in detail below with reference to the drawings.

Figures 3 to 6 show the two floating docks (1) (, 2) after modification.
＞, and Figure 1 shows the two tank forces (3) and (4) before modification.
The cross-sectional view is shown. The two tanks (3) and (4) are almost the same type, with the hull (5) of the first tank (3) and the second
Due to the transverse bulkhead, the hull (6) of the tongue force (4) is
It is divided into 7) (8), the stern part (9) (10), and the tank part between these parts. The tank section is divided into a plurality of front and rear compartments by a plurality of horizontal bulkheads, and these compartments are divided into a central tank (13) (14) and a side tank (15) by two rows of vertical bulkheads (11) (12).
(1G).

These two tankers (3) and (4) are converted into two floating docks (1 and 2) through the steps shown in Figure 2 as follows.

First, as shown in Figure 1, the two tank forces (3) (4)
are lined up in the dock (17) and docked. As shown in FIG.
19) and the surrounding area of the aggregate (20) attached to it, the front part of the tank (15) on the official side, just inside the longitudinal bulkhead (11) on the 6th side in front of this, the tank Immediately behind the transverse bulkhead (21) at the front end of the tank section, immediately inside the longitudinal bulkhead (11) on the plastering side, and immediately in front of the transverse bulkhead (22) at the rear end of the tank section, the cut upper deck (18) (19)
), the side shell plating on the military side (23), and the vertical bulkhead on the 6th side (
11) Cut and remove the mid-height of the transverse bulkhead and aggregate. Then, the cut upper decks (18) and (19) are lowered to an appropriate height on the bottom of the ship using a crane, etc., and then reattached to the hull (
5) to form a double bottom. In addition, when rejoining the upper deck (18) (19) separated from the hull (5), aggregate can be added if necessary. The upper deck (1B) (19) separated from the hull (5) and lowered to the bottom of the ship forms a lower deck (24) on the J3 and J6 side of the center of the hull, and the first floating The main part of the dock (1) is completed.At the same time, the outer tank upper deck (25) of the second tank (4) is completed.
The area excluding the front end of the upper deck (26) of the center tank and the surrounding area of the base material (27) attached to this is the front part of the outer tank (16) and the longitudinal part of the outer tank in front of this. Just inside the bulkhead (12), the transverse bulkhead (2) at the front end of the tank section.
8), cut immediately inside the longitudinal bulkhead (12) on the service side and immediately in front of the horizontal bulkhead (29) at the rear end of the tank section, and
In almost the same way as for the tongue force (3), lower the cut decks (25) and (26) to an appropriate height on the bottom of the ship to form a double bottom. As a result, the main part of the second floating dock (2) is completed, in which the low deck (30) is formed at the center of the center of the hull and on the outer mantle side.

The two floating docks (1) and (2) are almost bilaterally symmetrical, and the cross section of their midships is approximately U-shaped at the front end and oval-shaped at the rest. Also, the bow (7) (8) and stern (9) of the two floating docks (1) (2)
(10) remains the same, stern (9) (10)
The engine room and propulsion system remain intact, so
These floating docks (1) (2>) are capable of navigating with their own blades.

Upper tank deck on the outer side of the first floating dock (1) <31)
and the upper tank deck of the second floating dock (2) on the military side (
Rails (33) (34) and cranes (35) (3G) that travel on these are installed on top of the rails (32), respectively. In addition, the middle deck (37) (38 ) will be newly established as a parts manufacturing factory, and these side tanks (15)
(16) The ship's side outer panel (:39) (40) has a door (41) (42) and a door (43) (40) for loading and unloading parts.
4).

The first floating dock (1) is floated on the sea surface as shown in Figure 3, and by adjusting the ballast, it can be floated until the low deck (24) is above the sea surface, or it can be floated until the low deck (24) is submerged below the sea surface. submerged to a semi-submersible state. Floating dock (1)
When submerging the vessel in a semi-submersible state, the buoyancy of the bow (7) is smaller than that of the stern (9), and the buoyancy of the tank (15) on the side of the ship is smaller than that of the mantle side (15). Since the front end of the floating dock (1) remains intact, the floating dock (1) can be lowered equally from front to back and left to right as follows. In other words, 6
By using the front end of the side tank (15) remaining on the side tank (15) and the plastering side tank (15) as a buoyancy tank, the buoyancy in the front and rear is balanced and the floating dock (1) sinks evenly in the front and back. be able to.・Also, floating dock (1
) is loaded with seawater ballast inside the double bottom, but by installing appropriate seawater ballast inside the tank on the plastering side (15), the left and right floating horns are balanced and the floating dock is installed. (1) It is possible to sink evenly on both sides. In addition, since the bow section (7) and the stern section (9) remain intact, stability is good when submerged in a semi-submerged state. The same applies to the second floating dock (2).

Next, referring to Figures 4 to 6, a large offshore structure (45) such as an oil drilling rig is placed between two floating docks (1) (2>
This section explains the procedure for holding and storing the paper.

This structure (45) is located on the left and right sides, which are normally submerged under the sea surface.
A pair of lower floating bodies (46) and an upper body (47) always located above the sea surface are connected by a plurality of legs (48), and when accommodated in floating docks (1) and (2), the lower part Keep the floating body (46) afloat so that it is on the sea surface. Then, as shown in Figure 4, two floating docks (1)
(2) to the left and right sides of the structure (45) so as to sandwich the structure (45) between the official side of the first floating dock (1) and the outer clothing side of the second floating dock (2). and submerge it in a semi-submerged state. Next, as shown in Fig. 5, move the second floating dock (2) to the left so that its low deck (30) is located below the right lower floating body (46), and move the second floating dock (2) to the left. (1) to the right until it approaches the second floating dock (2) and move its low deck (24) to the left lower floating body (4G).
position it below. Next, two floating docks (1) (2
) at the same speed to gradually ascend these low decks (24
) (30) supports the left and right lower floating bodies (46) on top, and as shown in Figure 6 1, the two floating docks (1) ( 2) and lift the structure (45) above the sea surface.

When accommodating a small ship or offshore structure, either one of the floating docks (1) (2>) is used alone.In this case as well,
Ships and offshore structures enter and exit the dock by lowering the floating docks (1) and (2) to a semi-submerged state.
The side tank (15) that remains on the one side of the (1
If 6) is directed upwind to prevent wind and waves, and the opposite sentence is used to carry out docking and docking work for ships and offshore structures, work can be done easily without being affected by wind and waves.

Since the above-mentioned floating docks (1) and (2) are self-propelled, they can also be used as carriers. In addition, for example, in the case of a small boat that has caused a maritime accident, either party can go to the spot, take the small boat, perform emergency repairs, or return with the small boat intact. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of two tugboats before modification, and FIG. Figure 3 is a perspective view of the first floating dock after modification, and Figures 4 to 6 do not show the procedure for holding a large marine structure between two floating docks. 4 is a plan view, and FIGS. 5 and 6 are cross-sectional views. (1)'(2,)...Floating dock, (3)(4)...
Tongue force, (7) (8)... Bow section, <9) (10)
... Stern section, <11) (12) ... Longitudinal bulkhead, (13
) (14)...Central tank, (15) (1G)・
...Side tank, (18) (25)...Side tank upper deck, (19) (26)...Central tank upper deck. Patent applicant: Hitachi Zosen Corporation

Claims (1)

[Claims] This is a method of converting two tanks into floating docks, in which the tank section between the bow and stern is divided into a medium-fire tank and a side tank by two rows of vertical bulkheads. After cutting around the combined part of at least a part of the upper deck of the side tank and the upper deck of the medium tank, this is lowered to the bottom of the ship to form a double bottom, and the tank on the plastering side of the other tongue A method consisting of cutting around the combined part of at least a part of the upper deck and the upper deck of a medium-fired tank, and then lowering this to the bottom of the ship to form a double bottom.